Make sure you double plate; two 2x4's have the minimum burn time.Also, exterior walls are not always straight and sometime there are gaps where the stud walls adjoin.

Lots of properties built in the 1960's through 1980's have been purchased and renovated.

My only fear with doing that is some future regulation that dictates it must be removed which will be even harder with it buried beneath a layer of foam insulation and vinyl. 

I ended up going with one of their lines (called Nurture) that looks fairly high end but is pretty affordable- a full set of 2 soaps (one for the sink and one for the shower), shampoo, conditioner, and lotion, runs around $1.30 per bathroom, plus I supply toothbrush, toothpaste, shaving cream and razors, (also from Accent, average 40 cents each) but these rarely get used.

Shaving off equity and passing a deal on is not a "service" as most unlicensed brokers proclaim.

@Thomas S. have you seen the movie Idiocracy?  

Are you going to purchase them, to keep as a rental(s)?Have

Might undervalue it like mobiles or manufacture homes get a lot of tmes .. which then makes it hard for buyers to get financing  .. so with that in mind as long as you go into it with the assumption that your buyer may have to have a large amount down or all cash then your ok .. because .. the plus side it it is generally much cheaper to build a container house ..up to 56-60% but i would budget about 25-30% cheaper to be on the safe side .. also they go up quicker if you're u have someone who knows what they are doing .. biggest problem is getting the R value from siding and insulation high enough and safe from any toxic fumes they may have .. i think there is non toxic spray foam but i know isulation is a concern as is mold because of the insulation issue ( vapor barrier ) at least the sites a read ..  

If you leave ridges just let it dry and shave it off with a putty knife.

It was built in the 50-ies and there is little insulation (I doubt the blocks are filled with foam, etc).